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Old 06-20-2006, 05:22 AM   #21
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Some older Onans did not have a fuel filter, but if they did, it would be within a couple feet of the genny itself. Look underneath for the fuel line from the tank to the genny. Most fuel filters were metal tubes, about 3/4" dia. x 3' long. If you don't see a filter, then the problem is with the electric fuel pump. Get the genny serial & model numbers and place a call to Onan. (You could use a multimeter to make sure the fuel pump is getting 12vdc power). But that's about all you can do. I understand that these pumps are very low flow, maybe 1 gpm and low pressure, so an aftermarket auto replacement pump won't work...
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Old 06-20-2006, 05:42 AM   #22
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by troth:
Some older Onans did not have a fuel filter, but if they did, it would be within a couple feet of the genny itself. Look underneath for the fuel line from the tank to the genny. Most fuel filters were metal tubes, about 3/4" dia. x 3' long. If you don't see a filter, then the problem is with the electric fuel pump. Get the genny serial & model numbers and place a call to Onan. (You could use a multimeter to make sure the fuel pump is getting 12vdc power). But that's about all you can do. I understand that these pumps are very low flow, maybe 1 gpm and low pressure, so an aftermarket auto replacement pump won't work... </div></BLOCKQUOTE>

Coming off genny there's about a foot of rubber hose connected to about 18" of small diameter metal tubing then back to rubber hose.

Should gas flow out of this tubing when disconnected from genny?
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Old 06-21-2006, 02:20 AM   #23
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If you disconnect that fuel line at the rubber hose, it should leak a little fuel then stop. Your genny will have a fuel pump mounted right on the generator, then a short line to the carburetor. If there was a fuel filter, it'd be before the fuel pump.
You want to disconnect the fuel line going into the carburetor, then crank over the genny and see if fuel comes out of the disconnected line. If not, could be bad fuel pump motor or rubber diaphragm inside it. Also could be pinhole (air holes from corrosion) in any steel tubing line. A pin hole will allow air to suck in and with a low volume fuel pump like the Onan, it won't suck hard enough to overcome it.
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Old 06-21-2006, 04:33 AM   #24
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Talked to previous owner yesterday and he said he'd have to remove tube going to carb occassionally to get it to start. Once the rain stops here, I'll give it a try.

Also added Berryman B-12 to gas tank to see if eventually that'll help.
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